CVE-2024-43881: wifi: ath12k: change DMA direction while mapping reinjected packets

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-08-21 · updated 2026-08-04
Weakness: CWE-668

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: change DMA direction while mapping reinjected packets For fragmented packets, ath12k reassembles each fragment as a normal packet and then reinjects it into HW ring. In this case, the DMA direction should be DMA_TO_DEVICE, not DMA_FROM_DEVICE. Otherwise, an invalid payload may be reinjected into the HW and subsequently delivered to the host. Given that arbitrary memory can be allocated to the skb buffer, knowledge about the data contained in the reinjected buffer is lacking. Consequently, there’s a risk of private information being leaked. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00209-QCAHKSWPL_SILICONZ-1

Affected products

Linux kernel: from 6.3 before 6.6.44; from 6.7 before 6.10.3 — fixed in 6.10.3, 6.6.44

How to fix

Upgrade to a fixed version: Linux kernel 6.10.3, 6.6.44. Check the vendor advisory for mitigations.

References

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